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Holographic Non-Gaussianity

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arxiv 1011.0452 v2 pith:7FHLW3SP submitted 2010-11-01 hep-th astro-ph.COgr-qc

Paul McFadden , Kostas Skenderis This is my paper · ORCID
classification hep-thastro-ph.COgr-qc
keywords holographicbispectrumprimordialcosmologicaldualformulanon-gaussianityperturbations
verification ladder T0 review T1 audit T2 compute T3 formal
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We investigate the non-Gaussianity of primordial cosmological perturbations within our recently proposed holographic description of inflationary universes. We derive a holographic formula that determines the bispectrum of cosmological curvature perturbations in terms of correlation functions of a holographically dual three-dimensional non-gravitational quantum field theory (QFT). This allows us to compute the primordial bispectrum for a universe which started in a non-geometric holographic phase, using perturbative QFT calculations. Strikingly, for a class of models specified by a three-dimensional super-renormalisable QFT, the primordial bispectrum is of exactly the factorisable equilateral form with f_nl^eq=5/36, irrespective of the details of the dual QFT. A by-product of this investigation is a holographic formula for the three-point function of the trace of the stress-energy tensor along general holographic RG flows, which should have applications outside the remit of this work.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Higher-Spin Correlators in dS

    hep-th 2026-08 accept novelty 8.0 of 10

    The five-point de Sitter higher-spin correlator is shown to be a spurious-singularity-free rational function organized by graph-theoretic orbits of the complete graph K5.

  2. Cosmological Correlators in Gauge Theory and Gravity from EAdS

    hep-th 2025-09 conditional novelty 6.0 of 10

    Gauge and gravitational late-time correlators in de Sitter are mapped to EAdS Witten diagrams, with new Mellin-space propagators and a treatment of even boundary dimensions.

  3. Cross-Correlations of Metric and Monopole Perturbations from Holographic Cosmology

    hep-th 2026-07 conditional novelty 5.5 of 10

    At 1-loop in holographic cosmology, f_NL^{ξÃÃ}=0 while the angle-averaged f_NL^{γÃÃ}=6, from a full ⟨TJJ⟩ computation including contact terms.

  4. Integrable models of inflation beyond slow-roll

    hep-th 2026-08 conditional novelty 4.0 of 10

    Integrable inflationary models built from a chosen Hubble function yield power spectra, spectral indices, and tensor-to-scalar ratios, computed beyond slow-roll, that match currently available CMB data.

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